Frequency conversion dust-free screening and crushing integrated machine

Abstract

The invention relates to a frequency conversion dust-free screening and crushing integrated machine. The dust-free screening and crushing integrated machine comprises a machine frame and crushing cavities. The first crushing cavity is composed of a first-level crushing roller, a counter-attack plate and a first-level counter-attack roller; the second crushing cavity is composed of a second-level crushing roller and a screening roller; the third crushing cavity is composed of a third crushing roller and a screening roller. A rubber plate at the bottom of the dust-free screening and crushing integrated machine and a conveying belt form a compact cavity. The top of the dust-free screening and crushing integrated machine is further provided with a feeding inlet and an air suction opening, and an air suction and dust removal device is arranged outside the air suction opening. A material conveying belt at the feeding inlet is provided with a sensor which is connected with a logic controller, the logic controller is connected with an alternating-current frequency converter, and the alternating-current frequency converter is connected with a first-level motor, a second-level motor and a third-level motor. According to the frequency conversion dust-free screening and crushing integrated machine, the rotating speed of the motors can be adjusted according to the material flow, and the working efficiency is improved; accordingly, the no-load or overload phenomena, electric energy waste and excessive loss of equipment are avoided.

Description

Technical field [0001] The invention relates to a frequency conversion dust-free screening and crushing integrated machine. Background technique [0002] At present, the integrated screening and crushing machine being researched and developed continuously flattens the coal seam to the surface of the screen roller during the screening process. The first, second, and third crushing rollers are organically coordinated with the screen roller. The crushing process Screening is carried out in time, and the coal particles that meet the particle size requirements are screened and separated without repeated crushing, resulting in an efficient crushing effect. However, during the operation of the equipment, the amount of raw coal that needs to be screened and crushed will vary due to the quality of the raw coal. The three-stage rotor is directly powered by the industrial frequency power supply and rotates at a constant speed to crush the raw coal. It cannot be used for low-load equipment. ...

AI Technical Summary

Problems solved by technology

However, during the operation of the equipment, the amount of raw coal that needs to be screened and crushed will vary due to the quality of the raw coal. The three-stage rotor is directly powered by the power frequency power supply and rotates at a constant speed to crush the raw coal, which cannot meet the low load of the equipment. Or adjust the rotation of the three-stage crushing roller under variable load operating conditions

When the motor cannot run at full load, in addition to meeting the power drive requirements, the excess torque increases the consumption of active power, resulting in a waste of electric energy

Moreover, the three-stage rotor is prone to idling or overloading, which not only causes waste of electric energy, but also causes great wear and tear on equipment.

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